689629479440 has 80 divisors (see below), whose sum is σ = 1805575435776. Its totient is φ = 242684851200.

The previous prime is 689629479377. The next prime is 689629479457. The reversal of 689629479440 is 44974926986.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12612557 + ... + 12667116.

Almost surely, 2^689629479440 is an apocalyptic number.

It is an amenable number.

689629479440 is an abundant number, since it is smaller than the sum of its proper divisors (1115945956336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689629479440 is a wasteful number, since it uses less digits than its factorization.

689629479440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25279728 (or 25279722 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 68.

The spelling of 689629479440 in words is "six hundred eighty-nine billion, six hundred twenty-nine million, four hundred seventy-nine thousand, four hundred forty".